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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bc0397d8752dd93df4a378a6838980a9f8c20ef7bea8b659567adc0f01eedbb' 
  AND token = '3XgB/81eFcmoCS8Ajbuprz+rERYTtiQYIjpmYmPCUF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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