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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcae6a0a920eee48bb30fa379f7569490c93aff842630041bff0c76cc74c4733' 
  AND token = 'DPR4tT5LmErq5WR6tDFlxuh9grt3JFAen3zQxJeUgB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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