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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60f8a9aca0df073eb1d09573d750d9be6a3d833b420ace306b5b2fc2452054ce' 
  AND token = '3nULOcO9F7pmjXvk574IvKdFXr0vJIye8s1P8Uc16CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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