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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2da6b9bdb77e4714924ce875c396954d6c950f3e6f1294cf05c678335deb84f' 
  AND token = 'uDCclQEeMlkj3toEpItCdt1i619DARokdXhJyb8JKAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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