SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd15e24f36db5563b020de1ab36717ff2ac18291e6f949c1b211df0a8f5cc18a' 
  AND token = 'sBtFs0V9WAZ4SRpU2QjLPtwsBYwwqMUWWrUuHzfZPWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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