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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '531cc924c2f28d8e2e9e0ae4e6db9519904bbf8749360eb631d75a56dfc7d8c6' 
  AND token = 'b5c3mpr7HV2QJqvy8uCotvZApGKk7ARte1iZoEiR3BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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