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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62d544e7d7a947f17354be0b1407724485604a60971c6400311830643144ee97' 
  AND token = 'MUW4DzwqDH3Obaobtn7+hITOnKsbXw9aV5+s2gPhat0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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