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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10bc30fd9f5d9e9c5c3c78eaf7c117a0e6df58bcbcee15b765ac5f695189d3e3' 
  AND token = 'wBCmhMaGumXbjFd2sF01z7HVrWumLc/5Pb+MFBr2GcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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