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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6d60a9657a7fe61452fcecd7dcb3405e651e6b65ec7993400a935163ba667df' 
  AND token = 'xviGIeLmqENp7dBogmtvJK+rDT5aBEKI+5t679Rv260=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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