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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2817d78e2d86c5dd78eedb64b2d41fc696a485ae476ad26b90e3ba49f8e6b88a' 
  AND token = 'W6etY/huRnRzB/1NX6PtPvChGVn/kVTRaEMbBfyw8bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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