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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13830a272fde3238f3a8a49d670256c7f2a43747a5a27209351fa34782db14a7' 
  AND token = 'Q6NwOxD1JisggMfrHgYJ8BMUqdQocYH8nguNSPUxjeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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