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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dea300ef16b9079704e14af966e8c66524428e4de2b4727aa650a837f4f03f0f' 
  AND token = 'vebvXB0CcOSoTv5E97L7Py8JlZ34okyQFxIBEA3MZXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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