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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d8fa80e908217e2e346c8a0498f170fd05f03c39d040895dbc8e7010da72c64' 
  AND token = '0ulW2vQ4KqrncYxakGMi4Wkos/D7fuksyuCCbwOaA+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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