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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fecbe978ca37348e466a632da973004ea0810482182fb2be2c6c770dfee26061' 
  AND token = '/77jCzyq56j8mOM1gDTtcljmJRy4XRIca88K2yuqmWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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