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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98655c712cad8e6413a11861729db56c638d1332aca7672367ad9e41c30db893' 
  AND token = 'MJzXx8+ouhoEheINrXXKUlLzIcxU6YYzjsLfrzkaWHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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