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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3683e3e48f3463fea60bd09da51fb84f9f61f4f351e50d70f965622f5be5bf99' 
  AND token = '0kOWYYKeRpKgoR5mOh9V01KPu1xwUct9FeLgoS51TAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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