SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '953d7ba479bf57a2934e4c779e04d022cd6331cfcb67706b2598994e13640e6f' 
  AND token = 'gsYQIQ6ZYkdPdrD3z98lTI/jk/1ZK5txThKC7hAYeRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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