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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2424393c7639d362ab241b42edff9b8d4519444d01e8fee516f0d05e3e7be773' 
  AND token = '4PHsMh673qCuamjvYhd7O8maTi/FLLLLaa0HeiKcX4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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