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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2469f0ec44738d2cc10092abd7d392f1bf6d8263c134178782fec6fb7c1ae2e8' 
  AND token = '43IjSEgBfzDhjy7Ts4F68aP0yPh6dMSYpwO9X3uwxcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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