SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce106622c83503e43870d0ef4510c2de4515323b18984bbe600dacf09f86929b' 
  AND token = 'CXt4fhSjYWw6lr9iozfBzuV5RC78+GCHcdXBugM7SAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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