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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ebf9a4e6e307c7c7829ee5aabbe6b74647ff7419b043dcdf48a18199baed772' 
  AND token = 'rcz4Zx7mxUsTVHDH4+CijIOXSu1lAdy5I4JRj3eIJt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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