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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37bc46e6c959a206bfbbbd77e015f0862e22912160cf4aca81c53fac8310f518' 
  AND token = '/R3TI/1sFZxwMqEiuvXB5Ns8czgUDozQ6na10VZkIaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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