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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0c78e914ef8e3089f491c899ec05fcbdddd6bb5d59704944c869185c4f707ef' 
  AND token = 'BU/+b8gZYh4+iawbkpJg6QR0WMILFL5SbnuBvq0DQ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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