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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '433c76a7f23e64da88409a87f1775a48b322230e626034a9a595dc3b7328ac18' 
  AND token = 'lLd9IOaSAm2sucN9tGWL1/DlR7nna0VtvkZuiaD98dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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