SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '787b550f1f930b14ef2d65f6c1925e86963b34c44d447e5db1be55263a726a91' 
  AND token = '9UcG6OLSBhrHV9f8q8WJIrxQOVlopd7Z1zwXH/erdAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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