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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5175b4deac061f652a041cdee80840f8cb96c6eea33c5d02ece4cba9f2cd8160' 
  AND token = 'xh20I9EnxKJfE3K0RohZDAfBkri/A22lS3GBt1TFCgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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