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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '440fd7538d762f4373545985f8d803bbb72ed26d999993f8d96bc078a579dea9' 
  AND token = 'NoagJMLeWph/WDFsDK++yJ9eyCeaAGSwDXhIX9wFmDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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