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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58e0c1dbcbc4d80abed1f29761abb6bf83e8f3b36b70bb8fa3026c847b86c549' 
  AND token = 'kyJIdP6ZYXfd11AwphK7yRLwBCXAseJDMc8F4yIwB18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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