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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '832683b4f4a1b04511b9c78eb76586f7c5b3f9e1e6f2487d30e14d7743ad2b6f' 
  AND token = '+KzPbDc6fCxPCnJLOLEiibQOS0XDGWRXTD3k3dxGsmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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