SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84235dbaae42b7524e92018386bf60c5dce40a2dd7be2cb11a3aeb9c55598797' 
  AND token = 'uXMG6pM44KZwRrV7JtR+8ZC0XVodD+s2kkAYyqKgFmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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