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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c831a11fb62558b58cd9dc0a1ca84853b46b5391abb81dafdde7f42159ae9cd' 
  AND token = 'mYoiyDze1Jea/RD/QV0p4lF9+5SJhneYgfr1h7++iCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}