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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '279af309155377011dd9bbff4bf15d6ae195c62492b431aafe86fb9f12039343' 
  AND token = 'CkyWXCKmX6zeWmnXfFTfTYAHbhZCyPhONusOq0wttrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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