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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de038cc875e1ea393be8a7dfa2dc95041d9e879784ff29241b34aba507825e99' 
  AND token = 'eUIZ6gCDnPKw0xjT5ObMnq58aOE///lDptiDdn+qrDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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