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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b8b709dc7a6518d4ba4c60b0ebdfad03285c6e7f13655195bdf45ed8bb33b61' 
  AND token = 'BNE9QSQOw5NCWRRa/o4R5vklaI0cCSEyl70Eid2CyVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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