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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8759842fab05ee7e329f92b441795aece957e6a9a9deddf497d5ea4e9aee7ddf' 
  AND token = 'aEMJqEd76VVILLaX5WREDSdeK5xGg+EUcncFVhXuQP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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