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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc76c7238fa30de4d31933e89ec3f4bb14d124480c8e6694d21114994587268e' 
  AND token = 'UNLB3xfhBSh60FuwpWAAm0l5azhtaNMaQH1dRp7Jc6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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