SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14d88198ca6e99a7febfefc9cc0339bc241933420c6efe45e0ddd945cad706b6' 
  AND token = 'EV1UvFdf07LiUYLoqZ+8hmMFUifz1uZn9B/X4NcqpQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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