Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcf3e6f81b32b54c29c25248de1ec24025bea15bd26f5acb999f9bc1d824aa6b' 
  AND token = 'OQ6f7RnQUTJf7IMJEqD8qsOjWDIQB6f1IDEcvN5wwZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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