SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d704657a407a8b5b18f4d4dc5147c52d75287882568f21664bfd645cddc0647' 
  AND token = 'C/DTh5kXKDkhcqc/mv2GZD1KoXVYR0uNJhVnf51JC+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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