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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fc6bfa9ebb5af73eb8d874d7b8391f33f878ee98cd3f1f7cffd6ec1ed4d7bed' 
  AND token = 'zT92oZWgdC0Tf9pXaW5Du4X3jiZEkFB2oHmdX7XR7IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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