SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cece1f4e538bc3bd209eea50261262a42c73621bb9137bc774866e100fbab496' 
  AND token = 'uyv5QUSjwGqcmL+qNUYuBe5IgG/S5iANxPxM75RF8fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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