SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd156dd7bdba5c704433e88e485622b7d49b7f3f263d1739c75257d0388b8f768' 
  AND token = 'HJagSqUIy3nYwBS7mVfIE8SnUBfZRNxzl1RLmLSZciA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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