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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a56a8afb652ce141c86637d4dff0048b0b9d817cc74f641d95dc924d2e6e8c9' 
  AND token = '6WuAJ8XRS65gw9unWhN6yrO/qXscFsrn3NI+CUC8C5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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