SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddc970cfab2f8191e6a15031f8b9a66e194903723562a2311f5e74ef497c5214' 
  AND token = 'cYPWYB6nEJDsVWtBunOZWLtUOjHJu0BZoePhKRopEs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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