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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3da17a519c4178875c1f9f74d49cd55834dc7d2f6771fd4a5d37a5144c541e9' 
  AND token = '/76k6ZzYhsbk/lLdkh/HTpAwAas8rYNEl9RBPx7wqlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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