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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dc8e0fcf30c9971c92c1be1898e9339efa83ba3dd74043a3ea9eb6c059515da' 
  AND token = 'O1q0SzE5f5sZrjB4KgIQKMsMCzaAelw0KNhP1CokhlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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