SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a41477f23931a02ccc5e60bebbc9c75d511fcc9e589ef361db3e0fdca8b7711' 
  AND token = 'tEKTEYDvPxpFsCsZSjBRTjzTMLq5d2XYP7+s81xG0cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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