SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9332c1a915de7b6f9ffbbd592f70ca01381e60c643fbc813767b289274d39843' 
  AND token = 'JB4AvhE7/nvVccPd+H4NKkNrAAcNM0xjmgAH/pAoc/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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