SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2562fa5784a0f33d1609d74670c5d1ceff3374709084416bce89553e1e9cb18' 
  AND token = 'Fqx2fwL+MHYAHvE4uL28SRo+lPfiWGzvftEnGfvKgpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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