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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1177cd0d01c6a8dbc23f309e4c587d35789788aa0b7139d2615a2d19bda7a747' 
  AND token = 'De4MXEfDfOROrvTvYRAiiwKebHRLbWJOyThjrY1pDm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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