SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '661904d175a752f84aa39ab32ac05e693af007c912c3c94fa12f8982fe8e160c' 
  AND token = 'YPxxBTDOVLglqCXAbZJZTNSLg6iOIIxtvJQIfPDLoIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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