SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ded286b74b2d7d9bcb456a5deaceb80efbdff67fbcd0b3ff852d8517f461f4f' 
  AND token = 'ZJhFS+dTgnHlK7ZVWg1TGycp8PlQWruqjONHIjVX078=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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