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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e373420eac373bb2e3555435f2e36bc9f5df3737f23d884f52255d44973e1139' 
  AND token = 'iQIP5AW+6pWk9N3bQD5QaApPguUqjmyoag2kSqT52OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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