SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f82f415e61a2f3a8f8f91362f7073307f72d49819b411cefac810b22d767e1c8' 
  AND token = 'lo1BVYE8rpAKk5wR6nLU+CDqD/nBUVjXsqWZFBzN8G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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