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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e3f7ca546cbc4b072cc363ad244c84163b84070d9ddfefaebb5ece00ecc26f0' 
  AND token = 'GgVHZ6RMOWpyW0fda1g/xLj6/9fprNDRPns/lD5Pv5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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