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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5099c192689234b0ad240f37c4e3626c0565554e42943ba3cccc76cd0aa34d1' 
  AND token = 'e0EmUkoIKJ76L672sljERZ0PanxaqXAQUiVStAwI6rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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