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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '915d1c4f5602a79613e2b6f84d35322138f1f57751eb6abc98e1da76dcdd2fc7' 
  AND token = '7cryCYZ9OS/wYESK9OPirf+q6rtA9yFDeHn1ip2zU4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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