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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e16fa360d3667c0238d8eb8b3c83926a42338193c0153255ba59408cf6223fd' 
  AND token = 'xNmfpouecY7wzRPn9rFuI20Mz64/xezvG705hrGhzKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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